SIZING PRESSURE-RELIEF VALVES FOR TWO-PHASE FLOW

Guofu published a paper on "Chemical Engineering" Magazine. More details can be found at http://www.chemengonline.com/sizing-pressure-relief-valves-two-phases/.

Properly Size Pressure-Relief Valves for Two-Phase Flow Easier than API 520 HDI Method without Integration

Old Method

API 520 Part I (9th edition) selected three (3) methods to size two-phase PRV. One of them is the HDI (Homogeneous Direct Integration) method described in section C.2.1. HDI method involves generating multiple data points over an isentropic range of pressure from the inlet to the discharge. These data are used to evaluate the mass flux integral by direct numerical integration.

New Easier Method

An easier HD (Homogeneous Direct) method without integration, yet producing identical mass flux, is presented. The HD (Homogeneous Direct) method compares the velocity of fluid and the velocity of sound along the isentropic expansion path. The choke point is determined when the velocity of fluid equals the velocity of sound. The mass flux is then simply calculated by multiplying mass density and the velocity of fluid at the choke point. A detailed example is given in the presentation. The HD method is compared against the established data in “Benchmarking of two-phase flow through safety relief valves and pipes” by Shawn Adair and Harold Fisher. The mass flow rate through a 4P6 relief valve by HD method is well within the reasonable range, among other established methods.

What does a true standard condensate stabilizer look like?

Do you really have a true standard plant?

Do you have a standard plant? Many of us probably say yes.

Do you really have a standard plant? Only some of us might say yes with hesitation.

Do you really have a true standard plant? Only very few of us will say yes with confidence.

The reason why you don't have a standard plant

The reason why only very few of us have a true standard plant is that making plants standard is really, really, really hard. Many of us fail to answer the ultimate question: what's the output with the customer's particular input if they decide to choose your standard plant? We know the performance and the utility requirement at the design conditions of the standard plant, but how about the off-design conditions with a given set of existing equipment? In this video, you will learn what a true standard condensate stabilizer looks like.

Introduction to double-column Nitrogen Rejection Unit NRU

Introduction

It is estimated that 25% of the United States natural gas reserves contain unacceptably large quantities of nitrogen. Nitrogen is inert and lowers the BTU value of natural gas. It also takes up capacity in pipelines that could be used for valuable methane. Thus, nitrogen needs to be rejected from the gas through a Nitrogen Rejection Unit NRU. Typically, the feed to nitrogen rejection unit comes from the top of the DeMethanizer column of a cryogenic NGL recovery unit.

Using Dynamic Simulation to Improve a PRICO LNG Liquefaction Plant Operation

Guofu delivered this presentation at 2016 AICHE Spring meeting in Houston

Geothermal Power Plants Modeling 101: Rigorous Rating

Geothermal Power Plants Modeling 101: Rigorous Rating

     This blog is the first article in a series of Geothermal Power Plants Modeling. This 101 shows how a geothermal power plant is rigorously rated, thus the performance of the power plant can be guaranteed with great confidence.

Unveil the Mystery of Air Products APCI C3MR LNG Liquefaciton Process in HYSYS

You are an LNG professional. You understand Air Product C3MR is the most popular LNG liquefaction process. But do you really know all the ins and outs of the C3MR process? All the mystery of the APCI C3MR LNG process will be unveiled in this video.

Guofu completed 20 hours Pentair PSV training

Guofu completed 20 hours Pentair PSV training in October 2015

Using Dynamic Simulation to Increase the Output of a PRICO LNG Liquefaction Plant

The Problem

Do you ever want to increase the output of your PRICO LNG liquefaction plant? You used a steady state process simulator and designed a PRICO LNG plant to liquefy 280,000 lb/hr natural gas to -250 F. After you deliver to site, you are told that the natural gas flow will increase by 20% to 336,000 lb/hr. Do you think your PRICO LNG plant can still handle it?

Are You Leaving Money on the Table Without Optimizing Your ORC Power Plant?

You Want to Produce More Power via Your Geothermal ORC Power Plant?

Geothermal water is even more precious than the oil! Why? Because both of them use the same drilling process, yet water value is a lot less than the oil. Some companies use the geothermal water to produce electricity through an Organic Rankine Cycle (ORC). It costs so much to drill for the geothermal hot water. You surely want to maximize the potential of the hot geothermal water, don't you?